Publisher's Summary

Under the bubbling hot springs and geysers in Yellowstone National Park lies a supervolcano so large that it can be seen only from a plane or satellite. Most people don't know it's there. But it's overdue for an eruption, which would obliterate the landscape and change the climate, creating a dark, volcanic winter that could last for years.
For Alex, being left home alone for the weekend means the freedom to play his computer games and hang out with his friends without hassle from his mother. Then the Yellowstone supervolcano erupts, plunging his hometown into a nightmare of darkness, ash, and violence. Alex begins a harrowing trek to search for his family and finds help in Darla, a travel partner he meets along the way. Together they must find the strength and skills to survive and outlast an epic disaster.